Instruction Manual

45Publication 1753-UM001C-EN-P - March 2010 45
Chapter 3
General Wiring Considerations
Introduction
Prevent Electrostatic
Discharge
Power Supply
Considerations
The power supply must provide a voltage between 20.4 and
28.8V DC. You must supply enough power to drive the controller,
inputs, and outputs because all GuardPLC controllers and distributed
I/O modules source the current for the input channels and drive the
output devices connected to them. No additional power supply is
required to drive outputs. To operate, GuardPLC controllers typically
draw less than 1 A at 24V DC. They require additional power to
operate the inputs and outputs connected to the controller. Consider
the power draw of the I/O when specifying the size of the power
supply and required fusing.
Topic Page
Prevent Electrostatic Discharge 45
Power Supply Considerations 45
Ground the Equipment 46
Terminal Connections 47
Shield-contact Plate Connections 48
Detailed Wiring Information 48
ATTENTION
Electrostatic discharge can damage integrated circuits or
semiconductors. Follow these guidelines when you handle the
module.
• Touch a grounded object to discharge static potential.
• Wear an approved wrist-strap grounding device.
• Do not touch conductors or pins on component boards.
• Do not touch circuit components inside the equipment.
• Use a static-safe workstation, if available.
• Keep the equipment in appropriate static-safe packaging
when not in use.